Electric lamp



my T5 1930.

K. WIEGAND ELECTRIC LAMP Filed Dec. 1925 Patented July 15, 1930 UNITED STATES PATENT OFFICE.

xi'r'R'r WIEGAND, E BERLIN, GERMANY, ASSIGNOR TO GENERAL ELEorRIoooMrANY,

. A CORPORATIONOF NEW YORK ELECTRIC LAMP Application filed December 2, 1925. Serial 'No. 72,735, and in Gama February 9, 1925.

My present invention relates to electric lamps for use with high voltage circuits and to apparatus for applying high voltage currents to the lamp. It relates further to high ,5 voltage lamps, transformers and connections therefor. It relates more particularly to vapor arc lamps adapted for use with high volts age currents and to transformers and other apparatus therefor. I

Here tofore electric illuminating tubes and theirapparatus for use on sign boards, walls or ceilings have when used on high voltage circuits presented wiring difiiculties on account of safety requirements.

For this reason resort has been had to the use of boxes for holding the lighting tubes from the front of which the illuminating portions of the tubes extend and inside of which the electrodes,transformers and connections 2 are arranged. It has already been proposed,

with regard to sign boards to put up. a special box for the holding of all parts of the different high voltage tubes, as well as to arrange in the case of freely outstanding illuminating tubes a narrow box extending under or over the tubes for holding the electrodes, transformers and connections.

This invention allows the arrangement in a simple manner of the wiring of illuminating tubes in accordance with prevalent safety requirements and this is a simple and economical manner. For this purpose, according to this invention, a lampenvelope termina portion or bulb or even both bulbs or terminal portions of a single lamp, or two or more neighboring terminalportions or bulbs of difieernt lamps are surrounded by a substantially ring shaped transformer and enclosed with the transformer in a casing orto shell. If a choke coil, ohmic resistance or condenser is connected in series to the primary coil then these also can be formed in ring shape and laced inside of the casing or shell about the amp tube terminal or bulb. Ac- -cordingly one no longer needs large boxes,

often hard to attach, for the wiring of suchilluminating tubes and .for parts under a high tension. The cases or shells are formed as units with the electrode portions of the lamp, are hardly conspicuous and can be con- Fig. 1 is a vertical mid-section view through the endof a vapor arc lamp having a bulb terminal portion with an electrode therein and a lead sealed therethrough, a transformer in the shape of a ring positioned about the terminal portion of the lamp and a casing about the terminal and the trans former.

Fig. 2 is a transverse sectional view taken along line 22 of Fig. 1 and looking in the direction of the arrows.

Fig. 3 is a vertical mid-sectional view of a device similar tothat of Figs. 1 and 2 but in which the ring transformer is in the form of a conical frustum.

Fig. 4 is a transverse sectional view taken along the line H of Fig. 3 and looking in the direction of the arrows.

Fig. 5 is a plan view with the casing taken away showing an elongated ring shaped transformer and having positioned in its central opening two lamp terminals, and

Fig. 6 is a vertical mid-section of a terminal portion of a gaseous vapor lamp, a choke coil and a transformer formed in the shape of rings and positioned about the terminal portion of the-lamp and with a casing about the choke coil, the transformer and the terminal portion of the lamp.

In the embodiment illustrated in Figs. 1 and 2 the lamp tube terminal portion or bulb 0 provided at the end of the illuminating tube d and havingv the electrode 6 therein is encased in a bottle like she d. On the bottom of this shell is placed a ring shaped transformer f which surrounds said terminal portion a. The neck part of the shell d terminates at the outside in a suitable detachable end cover g.

In the embodiment illustrated in Figs. 3 and 4 the arrangement is essentially the same,

but in this case the shell (1 and also the ring shaped transformer f are made conical. In

order to give the transformer a safe hold in the shell (1, in case it is not fastened to the bottom 6, corresponding stops k, can be profiided in the shell, as indicated by the dotted nes.

If the primary and secondary coils of the transformer f are wound over one another, as is indicated in the embodiment of Figs. 1 and 2, then either a choke coil or an ohmic resistance or a condenser must be connected in series to the primary according to usual practice. But it is a good plan, as shown in Fig. 4 to arrange primary coil f and secondary coil 7 opposite each other upon the core of the transformer leaving the intermediate spaces f and with this arrangement of coils the transformer has a suflicient leakage so that the series connection of a choke coil and ohmic resistance or a condenser can be dispensed with.

In the embodiment illustrated in Fig. 5, two adjacent electrode enclosures 0 0 of two tubes (1, (1 arranged adjacent each other are surrounded by an oval ring transformer f and enclosed in a common shell al In this case also the transformer, with the simplification of the arrangement, possesses a suflicient leakage through placing the primary and secondary coils 7, f opposite each other. If the several tubes come together in a corner, then more than two electrodes can also be surrounded by a transformer carrying several coil-windings and can be built into a common shell.

Finally, in a given case if the transformer is not especially regulated for leakage, as illustrated in Fig. 6, a choke coil 73 just as the transformer f, can be arranged like a ring about the lamp terminal portion 0 inside of the shell d and as customary, can be connected in series to the primary coil. In this case, however, an intermediate insulating layer is suitably arranged between the choke coil i and the transformer In place of the choke coil 71 an ohmic reslstance, formed in ring shape, or a ring shaped condenser could be used.

The outer form of the shell which surrounds as closely as possible all the parts depends upon the size of the transformer and the formation of the terminal portion of the lamp. This arrangement of the transformer and other parts is particularly adapted for use in connection with electric lamps of'the.

vapor arc type but is applicable to electric lamps generally.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. In combination, a gaseous electric discharge illuminating tube and a transformer therefor, said transformer being shaped to surround one or more of the terminal portions of the tube.

2. In combination, with a ring shaped transformer, one or more gaseous electric discharge illuminating lamp terminal portions positioned within said transformer and means for connecting the lamp terminal to the transformer.

3. In combination with an electric lamp, a transformer and a regulating element therefor formed as an enclosure, one or more terminal portions of the lamp being positioned in the enclosure and connected to said regulating element and said transformer.

4. In combination' with an electric'vapor arc lamp having a terminal therefor, a transformer formed as an enclosure about said terminal and connected with the lamp.

5. In combination with an electric vapor arc lamp having a terminal therefor, a transformer formed as an enclosure about said terminal and connected with the lamp, and a casing about said transformer serving to securely hold-the lamp to the transformer.

6. An electric illuminating tube, with 'a transformer, characterized by the fact that an electrode enclosure 0 is surrounded-by a ring shaped transformer f and enclosed together with it in a shell d.

7. An electric illuminating tube, according to claim 6, characterized by the-fact that in the shell d, enveloping the electrode enclosure and the ring shaped transformer, a. current reglulating device is arranged surrounding t e electrode enclosure.

In witness whereof. I have hereunto set my hand this 13th day of November, 1925.

KURT WIEGAND. 

